2323 CMC Magnetics Acquires Securities in Nanya Technology

Release Date: July 2, 2026 Statement Date: July 1, 2026 Statement Time: 17:39 Company Code: 2323 Company Name: CMC Magnetics Corporation Subject: Announcement of Acquisition of Securities Applicable Clause: Item 20 Date of Fact: July 1, 2026

1. Security Name: Nanya Technology Common Stock

2. Transaction Date: July 1, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman July 1, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 1,580 Unit Price (NT$): 430.16 Total Transaction Amount (NT$): 679,660,605

6. Gain (or Loss) on Disposal (Not applicable for acquisition of securities): Not applicable

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Security (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., Pledging): Holding Balance: 3,124,000 shares, Amount: NT$1,411,638,876 Ownership Percentage: 0.09%, Restricted Rights: None

9. Proportion of Securities Investments (including this transaction) under Article 3 of the 'Asset Acquisition and Disposition Rules for Publicly Issued Companies' to Total Assets and Equity Attributable to Owners of Parent in the Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 83.39% Percentage of Equity Attributable to Owners of Parent: 119.77% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment portfolio management

11. Dissenting Director Opinions on This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Counterparty and Its Relationship with the Company: Not applicable

14. Date of Supervisor Approval or Audit Committee Consent: Not applicable

15. Previous Date of Material Information Disclosure for the Same Event: Not applicable

16. Other Disclosures: On June 30, 2026, authorized traders were granted permission to conduct securities transactions in the centralized market during the third quarter of 2026.